261312530 has 16 divisors (see below), whose sum is σ = 470646720. Its totient is φ = 104461872.

The previous prime is 261312523. The next prime is 261312551. The reversal of 261312530 is 35213162.

It is a junction number, because it is equal to n+sod(n) for n = 261312496 and 261312505.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11837 + ... + 25743.

It is an arithmetic number, because the mean of its divisors is an integer number (29415420).

Almost surely, 2^261312530 is an apocalyptic number.

261312530 is a deficient number, since it is larger than the sum of its proper divisors (209334190).

261312530 is a wasteful number, since it uses less digits than its factorization.

261312530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15793.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 261312530 is about 16165.1640882485. The cubic root of 261312530 is about 639.3226313154.

Adding to 261312530 its reverse (35213162), we get a palindrome (296525692).

The spelling of 261312530 in words is "two hundred sixty-one million, three hundred twelve thousand, five hundred thirty".